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    • 1. 发明授权
    • System for interpolating an arc for a numerical control system
    • 用于内插数字控制系统的电弧的系统
    • US4243924A
    • 1981-01-06
    • US916225
    • 1978-06-16
    • Fumio OnodaYutaka Kakizoe
    • Fumio OnodaYutaka Kakizoe
    • G05B19/4103G06F17/17G05B19/25
    • G05B19/4103
    • The coordinates (X.sub.n+1 Y.sub.n+1) of an arc to be traced at time t.sub.n+1 are preliminary calculated using the coordinates (X.sub.n Y.sub.n) at time t.sub.n, the radius (r) of the arc and a specified length l.sub.n during the time t.sub.n+1 -t.sub.n, thus the number of the calculations required for tracing an arc is considerably reduced and a low speed digital element which is cheap can be utilized in the present arc interpolation system. The formula for obtaining the coordinates is;X.sub.n+1 =X.sub.n +Y.sub.n .multidot.l.sub.n r-X.sub.n .multidot.l.sub.n.sup.2 /2r.sup.2Y.sub.n+1 =Y.sub.n -X.sub.n .multidot.l.sub.n /r-Y.sub.n .multidot.l.sub.n.sup.2 /2r.sup.2The asymptotic change of the above formulae and the apparatus according to the asymptotic formulae is also possible.
    • 使用时刻tn的坐标(Xn Yn),圆弧的半径(r)和规定的长度ln,在时刻tn + 1处追踪的弧的坐标(Xn + 1Yn + 1) 时间tn + 1-tn,因此用于跟踪电弧所需的计算次数大大减少,并且在当前的电弧插值系统中可以使用廉价的低速数字元件。 获得坐标的公式为; Xn + 1 = Xn + Ynxlnr-Xnxln2 / 2r2 Yn + 1 = Yn-Xnxln / r-Ynxln2 / 2r2上述公式的渐近变化和根据渐近公式的装置也是可能的。